Velocity interferometer system for any reflector (VISAR) interferometer was used in bigplate experiment to measure the movement of the flyer. The measured places of VISAR are: 0,10,20,40 and 80 mm,the corresponding angles of incidence are decided: 0°,4.5°,7.5°,10° and 11.5°. Results show that the velocity curves measured at different places are completely. The effective time of measuremnet is from 8 μs to 12 μs. VISAR testing technology with slanting incidence is feasible.